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Southpaw. What was the problem making the thump? I'm having the same thumping noise coming from the rear after I drive over bumps in the road. It rides really smooth until I drive over a sharp bump. I noticed it after I put my H&R coilovers in with RE rear shockmounts. It seems to be getting worse now that I've adjusted my coilovers all the way up to ship my car to Germany. I'm thinking the rear shock mounts could be the culprit. I could have sworn I torqued them down good. hmmmm...